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The official Couchbase JVM Core IO Library
/*
* Copyright 2022 Couchbase, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.couchbase.client.core.transaction.components;
import com.couchbase.client.core.annotation.Stability;
/**
* Metadata related to the CAS.
*
* (This was more useful when fallback logic existed for TXNJ-13 that could result in 'stale' non-current CAS, but is
* left as distinguishing between REAL and LOGICAL modes will help diagnosing any server clock problems.)
*/
@Stability.Internal
public enum CasMode {
// TXNJ-13: CAS came from ${vbucket.HLC.mode}, and the HLC is currently operating in normal mode.
REAL,
// TXNJ-13: CAS came from ${vbucket.HLC.mode}, and the HLC is currently operating in logical mode. That is, it is
// waiting for the wallclock to catch up, and is just incrementing by one for each mutation.
LOGICAL,
UNKNOWN
}